"21 Guns" is a song by American punk rock band Green Day. It was released as the second single from their eighth album, 21st Century Breakdown. The single was released through Reprise Records on May 25, 2009 as a digital download and July 14, 2009 as a CD single. The song has been a success on the Billboard Hot 100 chart, peaking at No. 22, which has become their highest charting single since 2005.